<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>__proto__</title>
</head>
<body>
  
</body>
<script>
var obj={};
console.log(obj.__proto__)
obj.__proto__ = ['push', 'pop', 'shift', 'unshift', 'splice', 'sort', 'reverse']
console.log(obj.__proto__)
</script>
</html>